CN114674566A - Dynamic control system and method for low-pressure simulation environment of internal combustion engine - Google Patents
Dynamic control system and method for low-pressure simulation environment of internal combustion engine Download PDFInfo
- Publication number
- CN114674566A CN114674566A CN202210190939.3A CN202210190939A CN114674566A CN 114674566 A CN114674566 A CN 114674566A CN 202210190939 A CN202210190939 A CN 202210190939A CN 114674566 A CN114674566 A CN 114674566A
- Authority
- CN
- China
- Prior art keywords
- exhaust
- pressure
- combustion engine
- internal combustion
- cabin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/02—Details or accessories of testing apparatus
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/20—Control of fluid pressure characterised by the use of electric means
- G05D16/2006—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means
- G05D16/2013—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means
- G05D16/2026—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means with a plurality of throttling means
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Automation & Control Theory (AREA)
- Testing Of Engines (AREA)
Abstract
The application provides a dynamic control system and a dynamic control method for a low-pressure simulation environment of an internal combustion engine, wherein the system realizes dynamic balance control of the ventilation volume of the internal combustion engine, the air supply volume of an air inlet fan and the air displacement of the internal combustion engine by arranging an air inlet pipeline and an exhaust pipeline of the internal combustion engine; the air inlet regulating valve, the air inlet bypass valve, the first exhaust regulating valve, the second exhaust regulating valve and the vacuum air inlet bypass valve coordinate air inlet and exhaust flow together, so that the accurate control of the air pressure in the low-pressure cabin is realized; the system obtains real-time feedback of air pressure in the low-air-pressure cabin through the air inlet flow meter, further realizes accurate control on transient air pressure of the internal combustion engine under variable working conditions, and ensures smooth performance of a low-air-pressure environment simulation test of the internal combustion engine.
Description
Technical Field
The application relates to the technical field of internal combustion engines and environment simulation, in particular to a system and a method for dynamically controlling a low-pressure simulated environment of an internal combustion engine.
Background
Various internal combustion engines designed and developed by taking plain areas as operating conditions have the performance reduction problem when operating in a low-pressure environment in plateau areas, and the performance reduction problem is specifically represented by the reduction of performance indexes such as dynamic performance, economy, starting performance, heat balance, reliability, durability, emission performance and the like, and the reduction amplitude is more obvious when the altitude is higher, so that the plateau maneuverability and the operation capability of power equipment are obviously reduced.
A plateau environment simulation test of the internal combustion engine is an important means for examining the plateau environment adaptability of the internal combustion engine and finding out design defects. With the deep research of the plateau environment adaptability of the internal combustion engine and the improvement of the altitude (2500m) in the national VI emission standard, the requirement of the WHTC transient test cycle of the national VI on the dynamic simulation control of the variable working condition variable altitude environment pressure of the internal combustion engine is higher and higher, and the simulation control method for adjusting the high altitude environment pressure of the internal combustion engine based on the steady state test working condition can not meet the requirement of the high altitude transient test of the internal combustion engine.
Disclosure of Invention
In view of the above, an object of the present application is to provide a dynamic control system and method for a low pressure simulation environment of an internal combustion engine.
Based on the above purpose, the present application provides a dynamic control system for a low-pressure simulation environment of an internal combustion engine, comprising a low-pressure chamber, an air inlet pipeline and an exhaust pipeline of the internal combustion engine, wherein:
the low-pressure chamber is configured to accommodate the internal combustion engine, the low-pressure chamber comprises a chamber air inlet and an internal combustion engine air outlet, the air inlet pipeline is connected with the chamber air inlet, and an exhaust pipe of the internal combustion engine, the internal combustion engine air outlet and the internal combustion engine exhaust pipeline are sequentially connected;
The air inlet pipeline comprises an air inlet fan, an air inlet adjusting valve, an air inlet bypass valve and an air inlet flowmeter; the air inlet fan, the air inlet regulating valve, the air inlet flow meter and the cabin air inlet are sequentially connected through a pipeline; the air inlet bypass valve is connected with a pipeline between the air inlet fan and the air inlet regulating valve through a pipeline;
the exhaust pipeline of the internal combustion engine comprises a first exhaust regulating valve, a second exhaust regulating valve, a vacuum intake bypass valve and a vacuum pump; the internal combustion engine exhaust port, the first exhaust regulating valve and the vacuum pump are connected in sequence through pipelines; the second exhaust regulating valve is connected with the first exhaust regulating valve in parallel through a pipeline, and the first exhaust regulating valve and the second exhaust regulating valve form an exhaust regulating valve group; the vacuum air inlet bypass valve is connected with a pipeline between the exhaust adjusting valve group and the vacuum pump through a pipeline.
Optionally, the system further comprises a cabin vent line, the low pressure cabin further comprising a cabin vent, wherein: the cabin exhaust pipeline comprises a cabin exhaust regulating valve and a cabin exhaust flowmeter, and the cabin exhaust port, the cabin exhaust regulating valve and the cabin exhaust flowmeter are sequentially connected through a pipeline; the cabin exhaust gas flow meter is also connected with a pipeline between the exhaust port of the internal combustion engine and the exhaust regulating valve group through a pipeline.
Optionally, the low-pressure chamber further comprises a pressure limiting valve, and a gas pressure sensor is further arranged in the low-pressure chamber.
Optionally, the governing valve admits air the bypass valve admits air first exhaust regulating valve the second exhaust regulating valve vacuum admission bypass valve and the regulating valve group is constituteed jointly to cabin exhaust regulating valve, cabin exhaust flowmeter and the flowmeter that admits air constitutes the flowmeter group, a serial communication port, the system still includes the computer, gas pressure sensor the regulating valve group and the flowmeter group all with computer communication connection.
Optionally, the internal combustion engine exhaust pipeline further comprises an exhaust pressure stabilizing tank, the exhaust pressure stabilizing tank is arranged between the internal combustion engine exhaust port and the exhaust regulating valve group and is connected with the internal combustion engine exhaust port and the exhaust regulating valve group through pipelines; and the cabin exhaust flow meter is connected with the exhaust pressure stabilizing box and the exhaust adjusting valve group through a pipeline.
Based on the above purpose, the present application further provides a dynamic control method for a low-pressure simulated environment of an internal combustion engine, where the method is implemented by using the dynamic control system for a low-pressure simulated environment of an internal combustion engine, and the method includes: controlling the regulating valve group to an initial state; starting the air inlet fan and the vacuum pump, and controlling the regulating valve group to regulate the air pressure in the low-pressure cabin according to real-time data monitored by the gas pressure sensor and the flow meter group, so that the air pressure in the low-pressure cabin is regulated to a target set value from normal pressure; and controlling the internal combustion engine to start running, controlling the regulating valve group to regulate the air pressure in the low-pressure cabin according to real-time data monitored by the gas pressure sensor and the flow meter group, performing an internal combustion engine working environment simulation test, and acquiring the internal combustion engine working data.
Optionally, the controlling the regulating valve group to an initial state includes: fully closing the intake bypass valve, fully opening the first exhaust adjustment valve, the second exhaust adjustment valve, the vacuum intake bypass valve, and the cabin exhaust adjustment valve, and setting the intake adjustment valve opening to a first opening.
Optionally, the internal combustion engine working environment simulation test includes a variable working condition transient test, the internal combustion engine is controlled to start operating, and the regulating valve set is controlled to regulate the air pressure in the low-pressure chamber according to the real-time data monitored by the gas pressure sensor and the flow meter set, so as to perform the variable working condition transient test, which includes: and changing the rotating speed of the internal combustion engine, and controlling the regulating valve group to regulate the air pressure in the low-pressure cabin according to real-time data monitored by the gas pressure sensor and the flow meter group so as to keep the air pressure in the low-pressure cabin at the target set value.
Optionally, the simulation test of the working environment of the internal combustion engine further includes a variable altitude test, which controls the internal combustion engine to start operating, and controls the regulating valve set to regulate the air pressure in the low-pressure chamber according to the real-time data monitored by the gas pressure sensor and the flow meter set, so as to perform the variable altitude test, including: and controlling the regulating valve group to regulate the air pressure in the low-pressure cabin according to real-time data monitored by the gas pressure sensor and the flow meter group so as to enable the air pressure in the low-pressure cabin to reach a variable pressure set value.
Optionally, the pressure limiting valve opens in response to real-time gas pressure data monitored by the gas pressure sensor being below a protection pressure set point.
From the above, the system and the method for dynamically controlling the low-pressure simulated environment of the internal combustion engine provided by the application can realize dynamic balance control of the air exchange volume of the internal combustion engine, the air supply volume of an air inlet fan and the air displacement of the internal combustion engine by arranging the air inlet pipeline and the exhaust pipeline of the internal combustion engine; the air inlet regulating valve, the air inlet bypass valve, the first exhaust regulating valve, the second exhaust regulating valve and the vacuum air inlet bypass valve coordinate air inlet and exhaust flow together, so that the accurate control of the air pressure in the low-pressure cabin is realized; the system obtains real-time feedback of air pressure in the low-air-pressure cabin through the air inlet flow meter, further realizes accurate control on transient air pressure of the internal combustion engine under variable working conditions, and ensures smooth performance of a low-air-pressure environment simulation test of the internal combustion engine.
Drawings
In order to more clearly illustrate the technical solutions in the present application or the related art, the drawings needed to be used in the description of the embodiments or the related art will be briefly introduced below, and it is obvious that the drawings in the following description are only embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram illustrating connection relationships among components of a dynamic control system for a low-pressure simulated environment of an internal combustion engine according to an embodiment of the present application;
FIG. 2 is a schematic diagram illustrating the connection relationship between the modules of the dynamic control system for low pressure simulated environment of an internal combustion engine according to the embodiment of the present application;
fig. 3 is a schematic diagram of a dynamic control method for a low-pressure simulated environment of an internal combustion engine according to an embodiment of the present application.
The reference numbers are as follows:
1. an intake bypass valve; 2. an intake air regulating valve; 3. an intake air flow meter; 4. a low-pressure chamber; 5. a cabin exhaust regulating valve; 6. a cabin exhaust gas flow meter; 7. a second exhaust gas regulating valve; 8. a first exhaust regulating valve; 9. a vacuum intake bypass valve; 10. an internal combustion engine; 11. an exhaust pressure stabilizing box; 12. a vacuum pump; 13. an air intake fan; 14. An air inlet; 15. an internal combustion engine exhaust pipe; 16. a pipeline between the air inlet fan and the air inlet regulating valve; 17. A cabin exhaust port; 18. an exhaust port of the internal combustion engine; 19. an air intake line; 20. a cabin exhaust line; 21. an exhaust line of the internal combustion engine; 22. a pressure limiting valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below with reference to the accompanying drawings in combination with specific embodiments.
It should be noted that technical terms or scientific terms used in the embodiments of the present application should have a general meaning as understood by those having ordinary skill in the art to which the present application belongs, unless otherwise defined. The use of "first," "second," and similar terms in the embodiments of the present application is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item preceding the word comprises the element or item listed after the word and its equivalent, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
One embodiment of the present application provides a dynamic control system for a low-pressure simulated environment of an internal combustion engine, as shown in fig. 1, comprising a low-pressure chamber 4, an air inlet pipeline 19 and an exhaust pipeline 21 of the internal combustion engine, wherein:
The low-pressure chamber 4 is configured to accommodate the internal combustion engine 10, the low-pressure chamber 4 comprises a chamber air inlet 14 and an internal combustion engine air outlet 18, the air inlet pipeline 19 is connected with the chamber air inlet 14, and the internal combustion engine exhaust pipeline 15 and the internal combustion engine air outlet 18 are connected with the internal combustion engine exhaust pipeline 21 in sequence;
the air inlet pipeline 19 comprises an air inlet fan 13, an air inlet regulating valve 2, an air inlet bypass valve 1 and an air inlet flow meter 3; the air inlet fan 13, the air inlet regulating valve 2, the air inlet flow meter 3 and the cabin air inlet 14 are connected in sequence through pipelines; the air inlet bypass valve 1 is connected with a pipeline 16 between the air inlet fan 13 and the air inlet regulating valve 2 through a pipeline;
the internal combustion engine exhaust pipeline 21 comprises a first exhaust regulating valve 8, a second exhaust regulating valve 7, a vacuum intake bypass valve 9 and a vacuum pump 12; the internal combustion engine exhaust port 18, the first exhaust regulating valve 8 and the vacuum pump 12 are connected in sequence by pipes; the second exhaust regulating valve 7 and the first exhaust regulating valve 8 are connected in parallel through a pipeline, and the first exhaust regulating valve 8 and the second exhaust regulating valve 7 form an exhaust regulating valve group; the vacuum intake bypass valve 9 is connected with a pipeline between the exhaust regulating valve group and the vacuum pump 12 through a pipeline.
The system provided by the embodiment of the application realizes dynamic balance control of the ventilation volume of the internal combustion engine, the air supply volume of an air inlet fan and the exhaust volume of the internal combustion engine by arranging the air inlet pipeline 19 and the exhaust pipeline 21 of the internal combustion engine; the air inlet regulating valve 2, the air inlet bypass valve 1, the first exhaust regulating valve 8, the second exhaust regulating valve 7 and the vacuum air inlet bypass valve 9 coordinate air inlet and exhaust flow together, so that accurate control of air pressure in the low-pressure cabin is realized, wherein the air inlet bypass valve 1 and the vacuum air inlet bypass valve 9 assist in regulating the air inlet and exhaust flow and can gradually approach to regulating the air pressure in the low-pressure cabin; the system obtains real-time feedback of the air pressure in the low-air-pressure cabin through the air inlet flow meter 3, so that the variable-working-condition transient air pressure of the internal combustion engine in the low-air-pressure cabin is accurately controlled, the air pressure fluctuation in the stable state of the low-air-pressure cabin is smaller than +/-0.5 kPa, the air pressure change in the low-air-pressure cabin is not smaller than +/-1 kPa in the process that the internal combustion engine is gradually accelerated to full speed and full load, and the smooth performance of a low-air-pressure environment simulation test of the internal combustion engine is ensured.
The air exchange amount of the internal combustion engine low-pressure simulation environment dynamic control system provided by the embodiment can reach 3000m3The air pressure in the low-pressure chamber is set to be 47kPa to 101 kPa. The cabin air inlet 14 of the low-pressure cabin 4, the engine air outlet 18 and a cabin air outlet 17 described below are sealed.
In specific implementation, the intake bypass valve 1 adjusts the intake flow by adjusting the difference between the flow of the fresh air sent by the intake fan 13 and the flow at the intake regulating valve 2.
In a specific embodiment, the first exhaust regulating valve 8 is configured to control a small flow of exhaust gas, and the second exhaust regulating valve 7 is configured to control a large flow of exhaust gas, which further ensures accurate control of the pressure in the low-pressure chamber and the transient pressure of the variable operating condition of the internal combustion engine in the low-pressure chamber.
In a specific embodiment, the vacuum intake bypass valve 9 is configured to adjust the vacuum intake bypass valve 9 to enable the exhaust flow of the exhaust line of the internal combustion engine to reach the requirement when the air extraction amount of the vacuum pump 12 cannot reach the requirement.
In some embodiments, as shown in fig. 1, the system further comprises a cabin vent line 20, the low pressure cabin 4 further comprises a cabin vent 17, the cabin vent line 20 comprises a cabin vent regulating valve 5 and a cabin vent flow meter 6, and the cabin vent 17, the cabin vent regulating valve 5 and the cabin vent flow meter 6 are connected in sequence by pipes; the cabin exhaust gas flow meter 6 is also connected by a conduit to a conduit between the internal combustion engine exhaust port 18 and the exhaust gas regulating valve block. Through setting up cabin exhaust damper valve 5 and cabin exhaust flowmeter 6, can further acquire the real-time feedback of low atmospheric pressure cabin internal gas pressure, further realize the accurate control to internal-combustion engine variable working condition transient state atmospheric pressure, further guaranteed going on smoothly of internal-combustion engine low atmospheric pressure environment simulation test.
In some embodiments, as shown in fig. 1, the low pressure chamber 4 further comprises a pressure limiting valve 22, and a gas pressure sensor is further disposed in the low pressure chamber. The pressure limiting valve 22 is positioned on the low-pressure chamber 4 and is arranged to penetrate through the low-pressure chamber. The pressure limiting valve 22 is automatically opened in response to the air pressure in the low-pressure chamber 4 being lower than 47kPa, so that the outside air enters the low-pressure chamber 4, and the low-pressure chamber 4 is prevented from being damaged.
In some embodiments, as shown in fig. 1 and fig. 2, the intake air regulating valve 2, the intake bypass valve 1, the first exhaust gas regulating valve 8, the second exhaust gas regulating valve 7, the vacuum intake bypass valve 9 and the cabin exhaust gas regulating valve 5 together form a regulating valve group, and the cabin exhaust gas flowmeter 6 and the intake gas flowmeter 3 form a flowmeter group; the system also comprises a computer, wherein the gas pressure sensor, the regulating valve group and the flow meter group are in communication connection with the computer.
In specific implementation, the computer is configured to receive real-time flow data measured by the flow meter group and control the regulating valve group to regulate the cabin air pressure of the low-pressure cabin according to the real-time flow data, so as to further ensure accurate control of the cabin air pressure of the low-pressure cabin and the transient air pressure of the internal combustion engine in the low-pressure cabin under variable working conditions.
In specific implementation, the regulating valves in the regulating valve group are all electric regulating valves, the flow meters in the flow meter group are all mass flow meters, and the types of the mass flow meters can be ToCeiL20N060, ToCeiL20N150, SUTO S401 or SUTO S421.
In some embodiments, as shown in fig. 1, the internal combustion engine exhaust pipeline 21 further includes an exhaust pressure stabilizing box 11, where the exhaust pressure stabilizing box 11 is disposed between the internal combustion engine exhaust port 18 and the exhaust valve group, and is connected to the internal combustion engine exhaust port 18 and the exhaust valve group through pipes; and the cabin exhaust gas flowmeter 6 is connected with a pipeline between the exhaust gas pressure stabilizing box 11 and the exhaust gas regulating valve group through a pipeline.
In a specific embodiment, the exhaust plenum is a hollow cavity with a cross section that may be round, square or other shape. The exhaust pressure stabilizing box is used for buffering gas exhausted by the internal combustion engine, so that an exhaust pipeline of the internal combustion engine runs stably, and the service life of the whole system is prolonged.
An embodiment of the present application further provides a method for dynamically controlling a low-pressure simulated environment of an internal combustion engine, where the method is implemented by using the above dynamic control system for a low-pressure simulated environment of an internal combustion engine, as shown in fig. 3, and the method includes:
And S101, controlling the regulating valve group to be in an initial state.
S102, starting the air inlet fan and the vacuum pump, and controlling the regulating valve group to regulate the air pressure in the low-pressure cabin according to real-time data monitored by the gas pressure sensor and the flow meter group, so that the air pressure in the low-pressure cabin is regulated to a target set value from normal pressure, and at the moment, each regulating valve in the regulating valve group is in a conventional state. Specifically, the air inlet regulating valve 2 is regulated and controlled in an open loop mode, the air inlet bypass valve 1, the first exhaust regulating valve 8 and the second exhaust regulating valve 7 are controlled to be regulated and controlled in a closed loop mode from an initial state according to real-time data monitored by the gas pressure sensor and the flow meter group, and the opening degree of the cabin exhaust regulating valve 5 is reduced compared with the initial state, so that the air pressure in the low-pressure cabin is regulated to a target set value from normal pressure.
S103, controlling the internal combustion engine to start running, controlling the regulating valve group to regulate the air pressure in the low-pressure cabin according to real-time data monitored by the gas pressure sensor and the flow meter group, carrying out a working environment simulation test of the internal combustion engine, and collecting working data of the internal combustion engine.
According to the method provided by the embodiment of the application, the computer controls the regulating valve group to regulate the air pressure in the low-pressure chamber according to real-time data monitored by the gas pressure sensor and the flow meter group, so that the dynamic balance control of the ventilation volume of the internal combustion engine, the air delivery volume of the air inlet fan and the air displacement of the internal combustion engine is realized, the accurate control of the air pressure in the low-pressure chamber is realized, the transient air pressure of the internal combustion engine in the low-pressure chamber under variable working conditions is further realized, the air pressure fluctuation in the low-pressure chamber is smaller than +/-0.5 kPa during steady state, the air pressure change in the low-pressure chamber is not smaller than +/-1 kPa during the process of gradually accelerating the internal combustion engine to full-speed full load, and the smooth performance of a low-pressure environment simulation test of the internal combustion engine is ensured.
Open-loop regulation in the embodiment of the application refers to a system control mode without feedback information, and when an operator starts the system to enable the system to enter an operating state, the system transmits an instruction of the operator to a controlled object at one time; the closed-loop regulation refers to a feedback information control mode, when an operator starts the system, control information is transmitted to a controlled object through system operation, and state information of the controlled object is fed back to the input so as to modify the operation process, so that the output of the system meets the expected requirement.
In some embodiments, the S101 comprises:
s201, completely closing the air inlet bypass valve, completely opening the first exhaust regulating valve, the second exhaust regulating valve, the vacuum air inlet bypass valve and the cabin exhaust regulating valve, and setting the opening degree of the air inlet regulating valve to be a first opening degree. In a specific embodiment, the first opening degree is 50%.
In some embodiments, the simulation test of the working environment of the internal combustion engine includes a transient test under variable working conditions, the operation of the internal combustion engine is controlled in S103, the regulating valve group is controlled to regulate the air pressure in the low-pressure chamber according to real-time data monitored by the gas pressure sensor and the flow meter group, and the transient test under variable working conditions includes:
and changing the rotating speed of the internal combustion engine, and controlling the regulating valve group to regulate the air pressure in the low-pressure cabin according to real-time data monitored by the gas pressure sensor and the flow meter group so as to keep the air pressure in the low-pressure cabin at the target set value.
The steps are as follows: when the rotating speed of the internal combustion engine is increased, the air inlet regulating valve 2 is in a normal state, the air inlet bypass valve 1, the first exhaust regulating valve 8 and the second exhaust regulating valve 7 are controlled to perform closed-loop regulation from the normal state according to real-time data monitored by the gas pressure sensor and the flow meter group, and the opening degree of the cabin exhaust regulating valve 5 is reduced compared with the normal state; when the rotating speed of the internal combustion engine is reduced, the air inlet regulating valve 2 is in a normal state, the air inlet bypass valve 1, the first exhaust regulating valve 8 and the second exhaust regulating valve 7 are controlled to perform closed-loop regulation from the normal state according to real-time data monitored by the gas pressure sensor and the flow meter group, and the opening degree of the cabin exhaust regulating valve 5 is increased compared with the normal state.
In some embodiments, the step S103 of controlling the internal combustion engine to start operating, wherein the simulation test of the operating environment of the internal combustion engine further includes a variable altitude test, controlling the internal combustion engine to start operating, and controlling the regulating valve set to regulate the air pressure in the low-pressure chamber according to real-time data monitored by the gas pressure sensor and the flow meter set, so as to perform the variable altitude test, and the method includes:
and controlling the regulating valve group to regulate the air pressure in the low-pressure cabin according to real-time data monitored by the gas pressure sensor and the flow meter group, so that the air pressure in the low-pressure cabin reaches a variable pressure set value. The variable pressure set value is an air pressure value higher or lower than the target set value, so that the purpose of simulating different altitude air pressures to carry out the variable altitude test is achieved.
The steps are as follows: when the variable pressure set value is higher than the target set value, controlling the air inlet regulating valve 2, the air inlet bypass valve 1, the first exhaust regulating valve 8 and the second exhaust regulating valve 7 to perform closed-loop regulation from a conventional state according to real-time data monitored by the gas pressure sensor and the flow meter group, and reducing the opening degree of the cabin exhaust regulating valve 5 compared with the conventional state; and when the variable pressure set value is lower than the target set value, controlling the air inlet regulating valve 2, the air inlet bypass valve 1, the first exhaust regulating valve 8 and the second exhaust regulating valve 7 to perform closed-loop regulation from a normal state according to real-time data monitored by the gas pressure sensor and the flow meter group, and increasing the opening degree of the cabin exhaust regulating valve 5 compared with the normal state.
In a specific embodiment, the vacuum intake bypass valve 9 is configured to adjust the vacuum intake bypass valve 9 to make the exhaust flow of the exhaust line of the internal combustion engine meet the requirement when the air extraction amount of the vacuum pump 12 cannot meet the requirement.
In some embodiments, the method further comprises: and responding to the real-time air pressure data monitored by the gas pressure sensor to be lower than a protection pressure set value, and opening the pressure limiting valve. The pressure limiting valve responds to the fact that the air pressure in the low-pressure cabin is lower than 47kPa, and is automatically opened, so that outside air enters low pressure, and the low-pressure cabin is prevented from being damaged.
The method of the above embodiment is used for implementing the corresponding internal combustion engine low-pressure simulated environment dynamic control system in any of the foregoing embodiments, and has the beneficial effects of the corresponding method embodiment, which are not described herein again.
It should be noted that the method of the embodiment of the present application may be executed by a single device, such as a computer or a server. The method of the embodiment can also be applied to a distributed scene and completed by the mutual cooperation of a plurality of devices. In such a distributed scenario, one of the multiple devices may only perform one or more steps of the method of the embodiment, and the multiple devices interact with each other to complete the method.
It should be noted that the foregoing describes some embodiments of the present application. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments described above and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the context of the present application, features from the above embodiments or from different embodiments may also be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of brevity.
In addition, well-known power/ground connections to various components may or may not be shown in the figures provided for simplicity of illustration and discussion, and so as not to obscure the embodiments of the application. Furthermore, devices may be shown in block diagram form in order to avoid obscuring embodiments of the application, and this also takes into account the fact that specifics with respect to implementation of such block diagram devices are highly dependent upon the platform within which the embodiments of the application are to be implemented (i.e., specifics should be well within purview of one skilled in the art). Where specific details are set forth in order to describe example embodiments of the application, it should be apparent to one skilled in the art that the embodiments of the application can be practiced without, or with variation of, these specific details. Accordingly, the description is to be regarded as illustrative instead of restrictive.
While the present application has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of these embodiments will be apparent to those skilled in the art in light of the foregoing description.
The present embodiments are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Therefore, any omissions, modifications, substitutions, improvements, and the like that may be made without departing from the spirit and principles of the embodiments of the present application are intended to be included within the scope of the present application.
Claims (10)
1. The dynamic control system for the low-pressure simulated environment of the internal combustion engine is characterized by comprising a low-pressure chamber, an air inlet pipeline and an exhaust pipeline of the internal combustion engine, wherein:
the low-pressure chamber is configured to accommodate an internal combustion engine, the low-pressure chamber comprises a chamber air inlet and an internal combustion engine air outlet, the air inlet pipeline is connected with the chamber air inlet, and an exhaust pipe of the internal combustion engine, the internal combustion engine air outlet and the internal combustion engine exhaust pipeline are sequentially connected;
the air inlet pipeline comprises an air inlet fan, an air inlet adjusting valve, an air inlet bypass valve and an air inlet flowmeter; the air inlet fan, the air inlet regulating valve, the air inlet flow meter and the cabin air inlet are sequentially connected through a pipeline; the air inlet bypass valve is connected with a pipeline between the air inlet fan and the air inlet regulating valve through a pipeline;
The exhaust pipeline of the internal combustion engine comprises a first exhaust regulating valve, a second exhaust regulating valve, a vacuum intake bypass valve and a vacuum pump; the internal combustion engine exhaust port, the first exhaust regulating valve and the vacuum pump are sequentially connected through pipelines; the second exhaust regulating valve is connected with the first exhaust regulating valve in parallel through a pipeline, and the first exhaust regulating valve and the second exhaust regulating valve form an exhaust regulating valve group; the vacuum air inlet bypass valve is connected with a pipeline between the exhaust adjusting valve group and the vacuum pump through a pipeline.
2. The dynamic control system for a low pressure simulated environment of an internal combustion engine of claim 1, further comprising a cabin vent line, said low pressure cabin further comprising a cabin vent, wherein:
the cabin exhaust pipeline comprises a cabin exhaust regulating valve and a cabin exhaust flowmeter, and the cabin exhaust port, the cabin exhaust regulating valve and the cabin exhaust flowmeter are sequentially connected through a pipeline; the cabin exhaust gas flow meter is also connected with a pipeline between the exhaust port of the internal combustion engine and the exhaust regulating valve group through a pipeline.
3. The dynamic control system for the low-pressure simulated environment of the internal combustion engine as claimed in claim 2, wherein the low-pressure chamber further comprises a pressure limiting valve, and a gas pressure sensor is further arranged in the low-pressure chamber.
4. The dynamic control system for a low pressure simulated environment of an internal combustion engine as claimed in claim 3, wherein said inlet regulating valve, said inlet bypass valve, said first exhaust regulating valve, said second exhaust regulating valve, said vacuum inlet bypass valve and said cabin exhaust regulating valve together comprise a regulating valve set, and said cabin exhaust gas flow meter and said inlet gas flow meter comprise a flow meter set; the system also comprises a computer, wherein the gas pressure sensor, the regulating valve group and the flowmeter group are all in communication connection with the computer.
5. The dynamic control system for the low-pressure simulated environment of the internal combustion engine as claimed in claim 2, wherein the exhaust pipeline of the internal combustion engine further comprises an exhaust pressure stabilizing tank, the exhaust pressure stabilizing tank is arranged between the exhaust port of the internal combustion engine and the exhaust regulating valve set and connected with the exhaust port of the internal combustion engine and the exhaust regulating valve set through pipelines; and the cabin exhaust flow meter is connected with the exhaust pressure stabilizing box and the exhaust adjusting valve group through a pipeline.
6. A method for dynamically controlling a low-pressure simulated environment of an internal combustion engine, wherein the method is implemented by using the system of any one of claims 1 to 5, wherein the system further comprises: the low-pressure cabin comprises a cabin exhaust pipeline, a cabin exhaust valve and a cabin exhaust flowmeter, wherein the cabin exhaust pipeline comprises the cabin exhaust regulating valve and the cabin exhaust flowmeter, and the cabin exhaust valve, the cabin exhaust regulating valve and the cabin exhaust flowmeter are sequentially connected through a pipeline; the cabin exhaust gas flow meter is also connected with a pipeline between the exhaust port of the internal combustion engine and the exhaust regulating valve group through a pipeline;
The low-pressure cabin also comprises a pressure limiting valve, and a gas pressure sensor is also arranged in the low-pressure cabin;
the air inlet adjusting valve, the air inlet bypass valve, the first exhaust adjusting valve, the second exhaust adjusting valve, the vacuum air inlet bypass valve and the cabin exhaust adjusting valve jointly form an adjusting valve group, and the cabin exhaust flowmeter and the air inlet flowmeter form a flowmeter group;
the method comprises the following steps:
controlling the regulating valve group to an initial state;
starting the air inlet fan and the vacuum pump, and controlling the regulating valve group to regulate the air pressure in the low-pressure cabin according to real-time data monitored by the gas pressure sensor and the flow meter group, so that the air pressure in the low-pressure cabin is regulated to a target set value from normal pressure;
and controlling the internal combustion engine to start running, controlling the regulating valve group to regulate the air pressure in the low-pressure cabin according to real-time data monitored by the gas pressure sensor and the flow meter group, performing an internal combustion engine working environment simulation test, and acquiring the internal combustion engine working data.
7. The dynamic control method for the low-pressure simulated environment of the internal combustion engine as claimed in claim 6, wherein the step of controlling the regulating valve group to the initial state comprises the steps of:
Fully closing the intake bypass valve, fully opening the first exhaust adjustment valve, the second exhaust adjustment valve, the vacuum intake bypass valve, and the cabin exhaust adjustment valve, and setting the intake adjustment valve opening to a first opening.
8. The dynamic control method for the low-pressure simulated environment of the internal combustion engine according to claim 6, wherein the simulation test for the operating environment of the internal combustion engine comprises a transient test under variable conditions, the internal combustion engine is controlled to start running, the regulating valve set is controlled to regulate the pressure in the low-pressure chamber according to real-time data monitored by the gas pressure sensor and the flow meter set, and the transient test under variable conditions is performed, and the transient test under variable conditions comprises:
and changing the rotating speed of the internal combustion engine, and controlling the regulating valve group to regulate the air pressure in the low-pressure cabin according to real-time data monitored by the gas pressure sensor and the flow meter group so as to keep the air pressure in the low-pressure cabin at the target set value.
9. The dynamic control method for the low-pressure simulated environment of the internal combustion engine as claimed in claim 6, wherein the simulation test for the working environment of the internal combustion engine further comprises a variable altitude test, the variable altitude test is performed by controlling the internal combustion engine to start running, and controlling the regulating valve set to regulate the air pressure in the low-pressure chamber according to the real-time data monitored by the gas pressure sensor and the flow meter set, and the method comprises:
And controlling the regulating valve group to regulate the air pressure in the low-pressure cabin according to real-time data monitored by the gas pressure sensor and the flow meter group so as to enable the air pressure in the low-pressure cabin to reach a variable pressure set value.
10. The dynamic control method for a low pressure simulated environment of an internal combustion engine as claimed in claim 6 wherein said pressure limiting valve is opened in response to real time pressure data monitored by said gas pressure sensor being below a protection pressure set point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210190939.3A CN114674566A (en) | 2022-02-28 | 2022-02-28 | Dynamic control system and method for low-pressure simulation environment of internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210190939.3A CN114674566A (en) | 2022-02-28 | 2022-02-28 | Dynamic control system and method for low-pressure simulation environment of internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114674566A true CN114674566A (en) | 2022-06-28 |
Family
ID=82073065
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210190939.3A Pending CN114674566A (en) | 2022-02-28 | 2022-02-28 | Dynamic control system and method for low-pressure simulation environment of internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114674566A (en) |
-
2022
- 2022-02-28 CN CN202210190939.3A patent/CN114674566A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102023096B (en) | Internal-flow high-altitude simulation test device and test method of aviation piston engine | |
| WO2020093264A1 (en) | Design method for optimizing aero-engine transition state control law | |
| CN105683542A (en) | Systems and methods for controlling EGR flow during transient conditions | |
| US20160153365A1 (en) | Method of Operation of a Gas Turbine Engine | |
| US20160053721A1 (en) | Gas turbine engine and method of operation | |
| CN101832861B (en) | Submarine environment condition simulating device for diesel engine | |
| CN104634578A (en) | Total environment high-altitude test system and total environment high-altitude test method for aviation turbocharged internal combustion engine | |
| US11629652B2 (en) | Metering pump system | |
| US11708795B1 (en) | Systems and methods for bleed valve control in fuel systems | |
| EP3724626B1 (en) | Device, method and use for conditioning intake air for testing internal combustion engines | |
| CN106768204A (en) | A kind of engine intake airflow calibration system and scaling method | |
| CN114204075B (en) | Fuel cell cathode control method | |
| CN217276877U (en) | Low-pressure simulation environment dynamic control system of internal combustion engine | |
| KR20160072698A (en) | Apparatus for controlling engine and method thereof | |
| US20180149099A1 (en) | Optimization-based controls for an air handling system using an online reference governor | |
| CN114674566A (en) | Dynamic control system and method for low-pressure simulation environment of internal combustion engine | |
| WO2015088662A2 (en) | System, method, and apparatus for variable geometry turbocharger control | |
| CN208650973U (en) | The adjustable two-stage electropneumatic pressure charging system of turbine bypass valve | |
| CN216241010U (en) | Aircraft fuel pressurization system | |
| CN105649796A (en) | Method for operating internal combustion engine | |
| AU2022385487A1 (en) | Heat engine system | |
| CN214533199U (en) | V-shaped engine airflow pressure stabilizing system | |
| CN114248935B (en) | Altitude state starting adjustment method for aeroengine | |
| KR101857276B1 (en) | Method for Air-control in Transient States Using Diesel Engine Throttle | |
| CN111727314A (en) | Compressor outlet pressure control using compressor recirculation valve and turbocharger wastegate to improve engine speed stability and performance |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |